Sprocket-wheel for motion-picture projectors.



1 A. A. REISING.

SPROCKET W FOR MOTION PICTURE PROJECTORS.

AP ATION FILED JUNE 23, 1914.

1,163,557. Patented Dec. 7, 1915.

IN VEN TQR.

WITNESSES.- My jam? 6. 6-, BY M mwfl- W ATTORNEY m STATES; 'ATNT FFICE.

ADAM ALOYS REISING, OF NEWARK, NEW JERSEY, ASSIGNOR OF ONE-HALF TO BRUNOREICHELT, OF NEWARK, NEW JERSEY.

S PROCKET-WHEEL FOR 'MOTION-PICT'URE PROJECTORS.

To all whom it may concern:

Be it known that I, ADAM ALOYS REISING, a subject of the King ofBavaria, citizen of the Empire of Germany, and residing at Newark, inthe county of Essex and State of New Jersey, United States ofAmerica,have

invented certain new and useful'Improvements in Sprocket-lVheels forMotion-Picture Projectors, of which the following is a specification.' II r This invention relates to sprocket wheels for motion pictureprojectors.

One object of the invention is the provision ofa sprocket wheel forsupporting the film of a picture projecting machine, the said sprocketwheel being sofconstructed' as to present no sharp, edges which wouldengage said film causing the latter to; wear or break. l 7

Another object of theinvention is the provision of a sprocket wheelwhich is so constructed that it will engage the film in spaced relationfrom the photographic film thereon, thus preventing the solution frombeing scraped from the film and preventing what is called rain inmovingpicture productions.

A further object of this invention is the provision of a sprocket wheelwhich comprises a plurality .of removable sections which may bedetachably connected for the purpose of replacing any of said sectionsif the same are worn or injured in any manner.

A still further object of the invention is the provision of a sprocketwheel which will be comparatively simple and inexpem sive tomanufacture, reliable and eflicient in use and readily assembled ordisconnected as desired.

l/Vith the above and other objects in view this invention relates to thenovel features of constructions, formations, combinations andarrangement of parts to be hereinafter more fully described, claimed andillustrated in the accompanying drawing, in which,

Figure 1 is a fragmentary view of a film designed to be used inconnection with my improved sprocket wheel; Fig. 2 is a longitudinalsectional view taken on the line 2-2 of Fig. 3. Fig. 3 is a sideelevation of my improved sprocket wheel; Fig. 4 is a cletailedtransverse sectional view taken on the Specification of Letters Patent.

Patented Dec. "7, 1915.

' Application filed June 23, 1914. Serial N 0. 846,866.

line 44 of Fig. 2, and Fig. 5 is a similar view taken on the line 5+5 ofFig. 2.

Referring to the accompanying drawing by similar characters of referencethroughout the several views, the numeral 6 designates, generally, myimproved sprocket wheel upon which the photographic film is shown at 7producing the pictures which are to be projected by the machine notshown in the drawing and which are spaced apart as shown at 8. The film7 is provided with a plurality of perforations 9 for a purpose to belater described. The pictures terminate in spaced relation to the edgesof the film 7 as clearly illustrated in Fig. l of the drawing anddesignated by the numeral 10. My sprocket wheel 6 comprises a circularbody portion 12 provided with a plurality of transverse openings .13 andradial ribs 14 formed with central sprocket teeth 15 which extendintermediate the opposite sides of the circular body portion 12 ofthesaid sprocket wheel 6. The circular caps 16 engage the oppositesides. of the body portion 12 and are formed with openings 17 and 18respectively, the latter being threaded as shown inyFig. 4 to receivethe threaded ends of the fastening members 19, which retain the saidcaps against displacement, with relation to said body portion 12.

As clearly shown in the drawing and especially in Figs. 8 and 4: theouter peripheries of the caps 16 lie flush with the outer sides of theribs 14 and flush with the inner ends of the sprocket teeth 15. Guideflanges 20 are formed upon the caps 15 and have their outer sides flushwith the outer faces of said caps and their inner sides beveled as at21, as clearly shown in the accompanying drawing. These flanges 20 areof a width substantially one-half the width of the before described caps16. Obviously, when the film 7 is passed over the sprocket wheel 6, theteeth 15 engage the openings 9 in said film, while the ribs 14: engagethe spaces between the pictures 11 without engaging the photographicsolution. The opposite edges of the film designated at 10 retain theinner edges of the caps 16 as clearly shown in Fig. 1.

My improved sprocket wheel will engage the film without engaging thephotographic solution thereon, and is of such construction as to preventany undesired movement of the film relative to the sprocket.

It will be manifest that a sprocket for motion picture projectingmachines is providedwhich fulfils all the necessary requirements of sucha device, it being understood that various minor changes in the specificdetails and constructions can be resorted to within the scope of theappended claims without departing from or sacrificing any of theadvantages of the invention.

Having thus fully described my invention what I claim as new and desireto protect by Letters Patent is 1. In a sprocket wheel, a body portionprovided with spaced transverse ribs having teeth formed with andprojecting from the ribs intermediate the ends of the latter, and capsdetachably secured to the sides of said body portion. I

2. In a sprocket wheel, a body portion provided with spaced transverseribs having teeth formed with and projecting from the ribs intermediatethe ends of the latter, and caps detachably secured to the sides of saidbody portion and provided with annular flanges projecting beyond. theribs and teeth.

3. In a sprocket wheel, a body portion provided with spaced transverseribs extending from side to side of the body portion and intermediatetheir ends having teeth arranged midway between the sides of the bodypor tion, and caps engaging the sides of said body portion. g

4:. In a sprocket wheel, a body portion provided with spaced transverseribs extending from side to side of the body portion and intermediatetheir ends having teeth arranged midway between the sides of the bodyportion, and caps engaging the sides of said body portion, said capslying flush with the ends of said ribs.

5. In a sprocket wheel, a body portion having spaced transverselyextending ribs formed on its periphery, the ribs having projectionsthereon extending therefrom intermediate the ends thereof to formsprocket teeth arranged midway between the sides of the annular bodyportion, caps secured to the, sides of the body portion and providedwith annular flanges forming guides.

6. In av sprocket wheel, an annular body portion having spaced ribsformed on its periphery transversely thereof and havingprojectionsforming sprocket teeth, the body portion having transverse apertures,caps engaging the sides of the body portion, one of the caps havingaplurality of screw threaded openings and the other cap having of thecaps having a plurality of screw threaded openings and the other caphaving a plurality of openings,'the openings in the caps and the bodyportion adapted to aline, and screw threaded elements passed through thealining apertures to secure the caps to the body portion, the caps lyingflush with the ends of said ribs and at their peripheries formingguides.

8. In a'sprocket, a body portion, caps engaging the opposite sidesthereof, said caps extending beyond the outer sides of said bodyportion, flanges formed upon said caps, said flanges being'spaced fromthe inner sides of said caps, ribs formed upon said body portion, saidribsvbeing flush with the outer sides ofsaid flanges, sprocket teethformed upon said ribs in spaced relation to said caps and means forretaining the caps in engagement with the body portion of said sprocket.

In testimony whereof I affix my signature in presence of two witnesses.

. ADAM' ALOYS REISING.

Witnesses:

EMIT ALEXANDER KERN, SAMUEL H. MILLS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Batents. Washington, D. G.

